Briefcase



FIG. 1 is a perspective view of a briefcase showing our new design;

FIG. 2 is a perspective view thereof as viewed from the opposite side of the briefcase shown in FIG. 1;

FIG. 3 is a side elevational view thereof as seen from the side of the briefcase shown in FIG. 1;

FIG. 4 is an end elevational view thereof as seen looking from either the left or right of FIG. 3, and

FIG. 5 is a perspective view thereof showing the briefcase partially open. 

The ornamental design for a briefcase, as shown and described. 